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Langston and Nick investigate a dead body dumped in a container in the desert along with surgical waste and various body parts, suspecting that Dr. Jekyll may be responsible, while Catherine investigates the murder of a female con artist at a hotel.

When lab tech Wendy discovers a second donor's DNA in the grout from the scene, Dr. Langston explains it is probably his epithelials from palpitating the grout, but refuses to has his DNA profiled in order to prevent the profile from ending up in a database, which Wendy will have to put in her report. He could have avoided the whole incident by simply scraping some more uncontaminated grout from between the tiles. ( a reasonable explanation would be if his carachter did this on purpose to make a statement or come back at it some later stage in the series etc.)

Dead bodies don't get goosebumps. When Catherine and Greg are fumin Karen Jones' body she has obvious goosebumps.